CVE-2016-4020 Affecting qemu package, versions <2.0.0+dfsg-2ubuntu1.24
Threat Intelligence
EPSS
0.06% (26th
percentile)
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Test your applications- Snyk ID SNYK-UBUNTU1404-QEMU-427745
- published 25 May 2016
- disclosed 25 May 2016
Introduced: 25 May 2016
CVE-2016-4020 Open this link in a new tabHow to fix?
Upgrade Ubuntu:14.04 qemu to version 2.0.0+dfsg-2ubuntu1.24 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream qemu package and not the qemu package as distributed by Ubuntu.
See How to fix? for Ubuntu:14.04 relevant fixed versions and status.
The patch_instruction function in hw/i386/kvmvapic.c in QEMU does not initialize the imm32 variable, which allows local guest OS administrators to obtain sensitive information from host stack memory by accessing the Task Priority Register (TPR).
References
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2016-4020
- http://git.qemu.org/?p=qemu.git;a=commit;h=691a02e2ce0c413236a78dee6f2651c937b09fb0
- https://lists.debian.org/debian-lts-announce/2018/11/msg00038.html
- https://security-tracker.debian.org/tracker/CVE-2016-4020
- https://security.gentoo.org/glsa/201609-01
- https://lists.gnu.org/archive/html/qemu-devel/2016-04/msg01106.html
- https://lists.gnu.org/archive/html/qemu-devel/2016-04/msg01118.html
- https://bugzilla.redhat.com/show_bug.cgi?id=1313686
- https://access.redhat.com/errata/RHSA-2017:1856
- https://access.redhat.com/errata/RHSA-2017:2392
- https://access.redhat.com/errata/RHSA-2017:2408
- http://www.securityfocus.com/bid/86067
- http://www.ubuntu.com/usn/USN-2974-1
- https://access.redhat.com/security/cve/CVE-2016-4020
- http://git.qemu.org/?p=qemu.git%3Ba=commit%3Bh=691a02e2ce0c413236a78dee6f2651c937b09fb0
CVSS Scores
version 3.1